Comparing Fission-product Yields from Photon-induced Fission of <sup>240</sup>Pu and Neutron-induced Fission of <sup>239</sup>Pu as a Function of Incident Energy
ORAL
Abstract
The Bohr Hypothesis, one of the most fundamental assumptions in nuclear fission theory, states that the decay of a compound nucleus with a given excitation energy, spin and parity is independent of its formation. Using fission product yields (FPYs) as a sensitive probe, we have performed novel high-precision test of the combined effects of the entrance channel, spin and parity on the fission process. Two different reactions were used in a self-consistent manner to produce a compound 240Pu nucleus with the same excitation energy: neutron induced fission of 239Pu and photon-induced fission of 240Pu. The FPYs from these two reactions were measured using quasimonoenergetic neutron beams from the TUNL’s FN tandem Van de Graaff accelerator [1] and quasimonenergetic photon beams from the HIGS facility. An updated comparison of the FPYs from 239Pu(n,f) at En=1.5 and 4.6 MeV with those from 240Pu(γ,f) at Eγ=8 and 11.2 MeV will be presented.
[1] M.E. Gooden et al., “Energy Dependence of Fission Product Yields from 235U, 238U and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV.” Nuclear Data Sheets 131, 319 (2016).
[1] M.E. Gooden et al., “Energy Dependence of Fission Product Yields from 235U, 238U and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV.” Nuclear Data Sheets 131, 319 (2016).
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
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Presenters
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Jack A Silano
- Lawrence Livermore National Laboratory